Teledyne T400, Руководство пользователя, Страница: 31 / 177

083730400A DCN8130 Teledyne API – Model T400 O
3
Analyzer 29
2.3.1.4 CONNECTING THE STATUS OUTPUTS (DIGITAL OUTPUTS)
The 12-pin STATUS connector allows the digital status outputs to report analyzer
conditions (configured through the Setup>Digital Outputs menu) via optically isolated
NPN transistors, which sink up to 50 mA of DC current. These outputs can be used to
interface with devices that accept logic-level digital inputs, such as Programmable Logic
Controllers (PLCs). Each status bit is an open collector output that can withstand up to
40 VDC. All of the emitters of these transistors are tied together and available at pin D
(see Figure 2-6).
ATTENTION COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Most PLCs have internal provisions for limiting the current
that the input will draw from an external device. When
connecting to a unit that does not have this feature, an
external dropping resistor must be used to limit the
current through the transistor output to less than 50 mA.
At 50 mA, the transistor will drop approximately 1.2V from
its collector to emitter.
STATUS
1 2 3 4 5 6 7 8 D
+
+5V to external device
Map the digital outputs 1 thru 8 through the
Setup>Digital Outputs menu.
Figure 2-6. Status Output Connector for Digital Outputs
Table 2-4. Status Output Pin Assignments
PIN
STATUS
DEFINITION
CONDITION
1-8
Configurable
through the
Setup>Digital
Outputs menu
Collector side of individual status output opto-isolators.
D Emitter BUS
The emitters of the transistors on pins 1 to 8 are bussed
together.
Blank NO CONNECTION
+ DC Power + 5 VDC, 300 mA source maximum
Digital Ground
The ground level from the analyzer’s internal DC power
supplies. This connection should be used as the ground
return when +5VDC power is used.